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Small Engines (Lawn Mowers, etc.)/Toro push mower that will not start


QUESTION: I have a toro push mower that I cannot get to start. It is three months old and has worked great up until recently. It has a Briggs and Stratton engine (model 120000). I have tried cleaning and then replacing the spark plug, replacing the air filer, removing the gas and putting fresh gas in, and cleaning the carb. My only concern is that I just noticed that I may have used gas oil mix the last time I mowed. I am guessing this may be my issue but I am not sure. Any ideas?

ANSWER: Did you blow compressed air through all the carb holes?  Did you replace the spark plug?  The plug may be fouled due to the gas/oil mix.


---------- FOLLOW-UP ----------

QUESTION: Yes. I tried cleaning the spark plug and then tried replacing it. I also blew air through all the carb holes using an air compressor. I am stumped. Would the oil and gas mixture do da,age elsewhere?

I have had customers run oil/gas mix in their mowers and it did not do any damage...other than they needed a complete tune-up.

Will the engine try to start if you prime it by squirtinf fuel directly into the carburetor?  It does not take much fuel to get the engine to try to start.

Is the engine and OHV or L head?  I need the model, type and code nubmer of the engine to check.


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Eric A. Jones


Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.


Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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